A new digester or engine for softening bones, containing the description of its make and use in these particulars: viz, cookery, voyages at sea, confectionary, making of drinks, chymistry, and dying. With an account of the price a good big engine will cost, and of the profit it will afford / [Denis Papin].

Denis Papin

Date:: 1681

Credit: A new digester or engine for softening bones, containing the description of its make and use in these particulars: viz, cookery, voyages at sea, confectionary, making of drinks, chymistry, and dying. With an account of the price a good big engine will cost, and of the profit it will afford / [Denis Papin]. Source: Wellcome Collection.

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$of coals that could make the Engine hot enough to dry a drop of water in 20 feconds, leaving afterwards the firetogooutofitfelf: and if I would fave time, I fhould make a good fire that the heat might quickly come to dry a drop of water in feconds, and presently take away all the fire : and fo in all other Operations, keep¬ ing full the proportion as 10 to yet I confefs this Rule is not demonftrated , neither doth the matter in hand require fuch a Mathematical exaftnefs. When I fay nothing of the inward preffure, as in this Rule, it is to be underftood that it ought to be always equal. E X P E R I At. IX. July xi. I took a Rabbet, and having filled with it two Glals-pots, and put fome water in one, and none in the other, I kindled five ounces of coals, and having preft the fire till a drop of water vvould dry away in 4 feconds, I let the fire go out of it felf. The Veffels being cooled, I found the Rabbets bones well foftned in the Pot with water ^ but in the other they were all very hard : yet the fle{h having been well feafoned, it was as tender and favoury as any Party can be $ but in the Pot with water it relifhed not fo well by a great deal. By this Experiment I faw that Rabbets bones are har¬ der than thole of Mutton : and I was more fully fatisfied that water helps much the foftning of bones. E X P E R I M. X. Propriety. I took another Rabbet, and having fhut it up, as in the former Experiment, I kindled five ounce; and half of coals ^ but the paper in the joynt of it having been fpoil- ed the inward preffure was not as rtrong again as the ordinary preffure of the Air, becaufe the water could get out s and for that reafon alfo the heat coukl not well be kept: for, notwithrtanding the quantity of coals in this Experiment was greater, the drop of water was twenty dims$

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